JPH0436382B2 - - Google Patents
Info
- Publication number
- JPH0436382B2 JPH0436382B2 JP59262175A JP26217584A JPH0436382B2 JP H0436382 B2 JPH0436382 B2 JP H0436382B2 JP 59262175 A JP59262175 A JP 59262175A JP 26217584 A JP26217584 A JP 26217584A JP H0436382 B2 JPH0436382 B2 JP H0436382B2
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- layer
- relationship
- exposure amount
- exposure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 14
- 230000007423 decrease Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 11
- 230000035945 sensitivity Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
＜技術分野＞
この発明は、複写機やプリンタ等に用いられる
感光体の露光量補正方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a method for correcting the exposure amount of a photoreceptor used in a copying machine, a printer, or the like.
＜発明の概要＞
この発明は、感光体ドラムの回転数を積算して
露光入力電圧を制御することにより、感光体の膜
厚減少による感度変化を補正するようにしたもの
である。<Summary of the Invention> The present invention corrects a change in sensitivity due to a decrease in the film thickness of the photoreceptor by integrating the number of rotations of the photoreceptor drum and controlling the exposure input voltage.
＜従来技術とその欠点＞
感光体にOPC膜を用いた複写機やプリンタに
おいて、画像のぼけが発生することがある。<Prior Art and Its Disadvantages> Image blurring may occur in copying machines and printers that use OPC films for photoreceptors.
この対策として、効率の良いオゾン抜きを行い
ながら感光体表面をクリーニング材を兼ねたブレ
ードで少しずつ切削するのが一般的となつてい
る。 As a countermeasure against this problem, it has become common practice to remove the ozone efficiently while cutting the surface of the photoreceptor little by little with a blade that also serves as a cleaning material.
しかし、感光体表面を削ると、コピーサイクル
中の感度が次第に変化する不都合がある。これは
感光体表面のOPC膜厚が小さくなることで帯電
能力が低下し、見かけ上の感度が上昇するからで
ある。 However, if the surface of the photoreceptor is scraped, the sensitivity during the copy cycle will gradually change. This is because as the OPC film thickness on the surface of the photoreceptor decreases, the charging ability decreases and the apparent sensitivity increases.
一方、感光体の疲労による感度補正方法として
は、特開昭54−29652号公報等に開示されている
ように、帯電電圧、露光量あるいは現像バイアス
を制御することを案出されている。 On the other hand, as a method for correcting the sensitivity due to fatigue of the photoreceptor, as disclosed in Japanese Patent Laid-Open No. 54-29652, etc., it has been devised to control the charging voltage, the exposure amount, or the developing bias.
しかし、これはあくまでも感光体疲労による場
合の補正方法であり、感光体表面のOPC膜を削
るものにそのまま適用できるものではない。 However, this is only a correction method for the case of fatigue of the photoreceptor, and cannot be directly applied to the method of scraping the OPC film on the surface of the photoreceptor.
たとえば上記帯電電圧を上げる方法を採用しよ
うとしても、高湿時にピンホールの発生の恐れが
ある。 For example, even if the above-mentioned method of increasing the charging voltage is adopted, there is a risk that pinholes will occur at high humidity.
また現像バイアスを下げる方法を採用した場合
には、地カブリが発生しやすくなる。 Furthermore, when a method of lowering the developing bias is adopted, background fog is more likely to occur.
＜発明の目的＞
この発明の目的は上記不都合を解消し、感光体
の膜減りによる感度変化を的確に補正できる感光
体の露光量補正方法を提供することにある。<Object of the Invention> An object of the present invention is to provide a method for correcting the exposure amount of a photoreceptor, which eliminates the above-mentioned disadvantages and can accurately correct changes in sensitivity due to film thinning of the photoreceptor.
＜発明の構成＞
この発明は、感光体がベースとCGL層とCTL
層とによつて構成され、上記CTL層がクリーニ
ングブレードによつて削られるようになされた電
子写真複写装置の感光体の露光量補正方法におい
て、上記感光体の回転総数とCTL層の膜厚との
関係、上記CTL層の膜厚と帯電電位との関係、
及び露光量と感光体の表面電位との関係に基づい
て、上記CTL層の膜厚の減少を回転総数に置き
換えて該回転総数と露光ランプの印加電圧との関
係を求めて予め設定しておくメモリ手段を設け、
感光体の累積回転総数に対応させて、上記メモ
リ手段に設定されたデータに基づいて露光ランプ
の印加電圧を露光量を低減する方向に制御するこ
とを特徴とする。<Structure of the invention> In this invention, a photoreceptor has a base, a CGL layer, and a CTL layer.
In a method for correcting the exposure amount of a photoreceptor of an electrophotographic copying device, the CTL layer is scraped by a cleaning blade, the total number of rotations of the photoreceptor and the film thickness of the CTL layer are The relationship between the thickness of the CTL layer and the charging potential,
Based on the relationship between the exposure amount and the surface potential of the photoreceptor, the decrease in the film thickness of the CTL layer is replaced with the total number of rotations, and the relationship between the total number of rotations and the voltage applied to the exposure lamp is determined and set in advance. The present invention is characterized in that a memory means is provided, and the voltage applied to the exposure lamp is controlled in a direction to reduce the exposure amount based on data set in the memory means in correspondence with the total number of cumulative rotations of the photoreceptor.
＜実施例＞
第１図はこの発明の実施例である感光体の露光
量補正方法に適用されるOPC感光体を有する感
光体ドラムの断面構造図である。<Example> FIG. 1 is a cross-sectional structural diagram of a photoreceptor drum having an OPC photoreceptor applied to a photoreceptor exposure amount correction method according to an example of the present invention.
図において、ベース１は、たとえばAl（アルミ
ニウム）からなる。このベース１の外周側にはキ
ヤリア発生に関与する顔料層、いわゆるCGL
（Carrier Genaration Layer）層２が形成されて
いる。このCGL層２の外周側にはキヤリア移動
に関与するOPC（Organic Photo Conductor）層
３が形成されている。このOPC層３は厚さ17μで
CTL（Carrier Transfer Layer）層とも呼ばれ、
上記CGL層２とで２層構造の感光体４を構成し
ている。上記CTL層３のみが、たとえばウレタ
ン製ブレード（図示せず）で削られるようになつ
ている。 In the figure, a base 1 is made of Al (aluminum), for example. On the outer circumferential side of this base 1 is a pigment layer involved in carrier generation, so-called CGL.
(Carrier Generation Layer) layer 2 is formed. On the outer peripheral side of this CGL layer 2, an OPC (Organic Photo Conductor) layer 3, which is involved in carrier movement, is formed. This OPC layer 3 has a thickness of 17μ.
Also called CTL (Carrier Transfer Layer) layer,
Together with the CGL layer 2, a photoreceptor 4 having a two-layer structure is constructed. Only the CTL layer 3 is scraped, for example, with a urethane blade (not shown).
第２図は一定のチヤージヤ出力値における
CTL層３の膜厚と帯電電位（帯電能）との関係
を示すものである。上記CTL層の膜厚と帯電電
位とは比例関係にある。 Figure 2 shows a constant charge output value.
It shows the relationship between the film thickness of the CTL layer 3 and charging potential (charging ability). The thickness of the CTL layer and the charging potential are in a proportional relationship.
第３図はCTL層３の膜厚が15μと17μの場合の
露光量と表面電位（明部の電位）との関係を示し
たものである。表面電位は露光量の小さい領域で
大きく変化するため、CTL層３の膜厚が15μで
17μと同一表面電位を得るためには露光量を小さ
くする必要がある。 FIG. 3 shows the relationship between the exposure amount and the surface potential (potential in bright areas) when the thickness of the CTL layer 3 is 15 μm and 17 μm. Since the surface potential changes greatly in areas with small exposure, it is
In order to obtain the same surface potential as 17μ, it is necessary to reduce the exposure amount.
いま、適性コピーのとれる表面電位がVLであ
る場合、膜厚17μの時は露光量はｌ１であるが、
膜厚が15μになると、上記表面電位VLを得るた
めの露光量はｌ２となる。 Now, if the surface potential at which a suitable copy can be taken is VL, the exposure amount is l1 when the film thickness is 17μ, but
When the film thickness becomes 15 μm, the exposure amount to obtain the above-mentioned surface potential VL becomes 12.
CTL層３の膜厚が15μの時の表面電位が適性値
VLとなるように露光量を制御した際の露光量と
表面電位との関係を第４図に実線で示す。点線は
露光量を制御する前の露光量と表面電位との関係
を示す。この図から明らかなように、実線で示し
た曲線は第３図におけるCTL層３の膜厚が17μの
場合の曲線とほぼ一致していることがわかる。 The surface potential when the thickness of CTL layer 3 is 15μ is the appropriate value.
The solid line in FIG. 4 shows the relationship between the exposure amount and the surface potential when the exposure amount is controlled to be VL. The dotted line indicates the relationship between the exposure amount and the surface potential before the exposure amount is controlled. As is clear from this figure, the curve shown by the solid line almost coincides with the curve shown in FIG. 3 when the thickness of the CTL layer 3 is 17 μm.
従つて、上記CTL層３がブレードによつて削
られることによる感光体の膜厚減少量を感光体ド
ラムの回転総数として検出し、この回転総数に応
じて露光量を低減する方向に露光ランプの印加電
圧を制御することにより、その時の適性値の表面
電位が得られ、感光体の感度補正がなされること
になる。 Therefore, the amount of decrease in the film thickness of the photoreceptor due to the CTL layer 3 being scraped by the blade is detected as the total number of rotations of the photoreceptor drum, and the exposure lamp is adjusted to reduce the exposure amount in accordance with this total number of rotations. By controlling the applied voltage, a surface potential of an appropriate value at that time can be obtained, and the sensitivity of the photoreceptor can be corrected.
以下、この発明の感光体の露光量補正方法に適
用される装置の構成を説明する。 The configuration of an apparatus applied to the photoreceptor exposure amount correction method of the present invention will be described below.
第５図は同装置のブロツク図、第６図はその具
体的回路図である。 FIG. 5 is a block diagram of the same device, and FIG. 6 is a specific circuit diagram thereof.
図において、感光体ドラム回転数検出回路５か
らの感光体ドラム回転数に比例したクロツク信号
Ｃは不揮発性記憶素子からなり、第７図のような
特性をもつたアナログメモリ６に入力される。 In the figure, a clock signal C proportional to the number of rotations of the photoreceptor drum from a photoreceptor drum rotation number detection circuit 5 is input to an analog memory 6 which is made up of a non-volatile memory element and has characteristics as shown in FIG.
上記アナログメモリ６は上記回転数を記憶し、
それに応じた出力電圧V0を発生する。アナログ
メモリ６は、たとえば第７図のＡ点で電源を切つ
てもその出力電圧を保持しているので、感光体ド
ラム回転数を累積加算していくことができる。 The analog memory 6 stores the rotation speed,
Generates an output voltage V 0 accordingly. Since the analog memory 6 retains its output voltage even if the power is turned off, for example, at point A in FIG. 7, it is possible to cumulatively add up the number of rotations of the photosensitive drum.
すなわち、このアナログメモリ６は上記感光体
ドラム回転数検出回路５とで感光体ドラムの回転
総数を感光体膜厚の減少量として検出する手段８
を構成している。 That is, this analog memory 6 and the photoreceptor drum rotation speed detection circuit 5 provide means 8 for detecting the total number of rotations of the photoreceptor drum as the amount of decrease in the photoreceptor film thickness.
It consists of
第７図におけるdV0／dtは任意に設定できるの
で、第２図および第３図に示す膜厚と帯電電位と
の関係および露光量と表面電位との関係に基づい
て予め実験によつて回転総数と露光量、つまり露
光ランプ１０の通電角との関係を設定しておけ
ば、アナログメモリ６の出力電圧V0によつて露
光ランプ位相制御手段９を介して露光量を制御す
ることにより、上記第２図および第３図に示すよ
うに実際には膜厚によつて変化する感光体の感度
を感光体ドラムの回転総数に基づいて補正するこ
とができる。 Since dV 0 /dt in Fig. 7 can be set arbitrarily, it can be rotated in advance through experiments based on the relationship between film thickness and charging potential and the relationship between exposure amount and surface potential shown in Figs. 2 and 3. By setting the relationship between the total number and the exposure amount, that is, the energization angle of the exposure lamp 10, the exposure amount can be controlled via the exposure lamp phase control means 9 using the output voltage V0 of the analog memory 6. As shown in FIGS. 2 and 3 above, the sensitivity of the photoreceptor, which actually changes depending on the film thickness, can be corrected based on the total number of rotations of the photoreceptor drum.
すなわち、第６図において、アナログメモリ６
の出力電圧V0が増大していくと、フオトカプラ
９１の発光ダイオード９２の明るさが増してい
き、それに伴つて受光素子９３の抵抗Ｒが小さく
なつていく。 That is, in FIG. 6, the analog memory 6
As the output voltage V 0 increases, the brightness of the light emitting diode 92 of the photocoupler 91 increases, and the resistance R of the light receiving element 93 decreases accordingly.
ダイアツク９５のトリガ信号が、時定数Ｔ＝
１／CRでトライアツク９６に入力されるため、
露光ランプ１０の通電角が変化して実効成分を小
さくしていき、露光ランプ１０の明るさが暗い方
へ変化させられる。 The trigger signal of the dial 95 has a time constant T=
Since it is input to the triack 96 at 1/CR,
The energization angle of the exposure lamp 10 is changed to reduce the effective component, and the brightness of the exposure lamp 10 is changed to a darker side.
なお、リレー接点１２は複写シーケンスで駆動
される露光タイミング用である。 Note that the relay contact 12 is used for exposure timing driven in the copying sequence.
＜発明の効果＞
この発明によれば、感光体の膜厚減少による感
度変化を、簡単な構成で正確に補正できる。<Effects of the Invention> According to the present invention, sensitivity changes due to a decrease in the film thickness of a photoreceptor can be accurately corrected with a simple configuration.
また、帯電電圧を上げたり、現像バイアスを下
げたりしないのでピンホールの発生や地カブリの
発生のおそれがなく、画像品質の向上が図れる。 Furthermore, since the charging voltage is not increased or the developing bias is not decreased, there is no fear of pinholes or background fog, and image quality can be improved.
第１図はこの発明の実施例である感光体の露光
量補正方法に適用される感光体ドラムの断面構造
図、第２図は感光体膜厚と帯電電位との関係を示
す特性図、第３図は感光体膜厚の異なるものの露
光量と表面電位との関係を示す特性図、第４図は
感光体膜厚が減少した際の補正前後の露光量と表
面電位との関係を示す特性図、第５図はこの発明
の感光体の露光量補正方法に適用される装置のブ
ロツク図、第６図は第５図のものの具体的回路
図、第７図は第５図および第６図のアナログメモ
リの特性図である。
８……感光体ドラム回転総数検出手段、９……
露光量制御手段。
FIG. 1 is a cross-sectional structural diagram of a photoreceptor drum applied to a photoreceptor exposure amount correction method according to an embodiment of the present invention, FIG. 2 is a characteristic diagram showing the relationship between photoreceptor film thickness and charging potential, and FIG. Figure 3 is a characteristic diagram showing the relationship between exposure amount and surface potential for photoreceptors with different film thicknesses, and Figure 4 is a characteristic diagram showing the relationship between exposure amount and surface potential before and after correction when the photoreceptor film thickness is reduced. 5 is a block diagram of an apparatus applied to the photoreceptor exposure amount correction method of the present invention, FIG. 6 is a specific circuit diagram of the device shown in FIG. 5, and FIG. 7 is a diagram of the device shown in FIGS. FIG. 2 is a characteristic diagram of an analog memory of FIG. 8... Total number of photosensitive drum rotations detection means, 9...
Exposure control means.
Claims (1)
て構成され、上記CTL層がクリーニングブレー
ドによつて削られるようになされた電子写真複写
装置の感光体の露光量補正方法において、 上記感光体の回転総数とCTL層の膜厚との関
係、上記CTL層の膜厚と帯電電位との関係、及
び露光量と感光体の表面電位との関係に基づい
て、上記CTL層の膜厚の減少を回転総数に置き
換えて該回転総数と露光ランプの印加電圧との関
係を求めて予め設定しておくメモリ手段を設け、 感光体の累積回転総数に対応させて、上記メモ
リ手段に設定されたデータに基づいて露光ランプ
の印加電圧を露光量を低減する方向に制御するこ
とを特徴とする感光体の露光量補正方法。[Scope of Claims] 1. Exposure amount correction of a photoreceptor of an electrophotographic copying apparatus, in which the photoreceptor is composed of a base, a CGL layer, and a CTL layer, and the CTL layer is scraped by a cleaning blade. In the method, the CTL is determined based on the relationship between the total number of rotations of the photoreceptor and the thickness of the CTL layer, the relationship between the thickness of the CTL layer and the charging potential, and the relationship between the exposure amount and the surface potential of the photoreceptor. A memory means is provided in which the decrease in the thickness of the layer is replaced with a total number of rotations, and a relationship between the total number of rotations and the voltage applied to the exposure lamp is determined and preset. A method for correcting exposure amount of a photoreceptor, comprising controlling an applied voltage of an exposure lamp in a direction to reduce the amount of exposure based on data set in a means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59262175A JPS61138267A (en) | 1984-12-10 | 1984-12-10 | Method for correcting sensitivity of photosensitive body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59262175A JPS61138267A (en) | 1984-12-10 | 1984-12-10 | Method for correcting sensitivity of photosensitive body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61138267A JPS61138267A (en) | 1986-06-25 |
| JPH0436382B2 true JPH0436382B2 (en) | 1992-06-16 |
Family
ID=17372107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59262175A Granted JPS61138267A (en) | 1984-12-10 | 1984-12-10 | Method for correcting sensitivity of photosensitive body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61138267A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02287480A (en) * | 1989-04-28 | 1990-11-27 | Ricoh Co Ltd | Image forming device |
| JPH0457068A (en) * | 1990-06-27 | 1992-02-24 | Minolta Camera Co Ltd | Image forming device |
| JPH0527557A (en) * | 1991-07-23 | 1993-02-05 | Sharp Corp | Electrostatic charging device |
| EP0568352B1 (en) * | 1992-04-28 | 1998-10-28 | Canon Kabushiki Kaisha | Image forming apparatus having charging member |
| JP3109981B2 (en) * | 1995-06-30 | 2000-11-20 | キヤノン株式会社 | Image forming device |
| JP2019035866A (en) * | 2017-08-17 | 2019-03-07 | 富士ゼロックス株式会社 | Image formation apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52113225A (en) * | 1976-03-19 | 1977-09-22 | Mitsubishi Electric Corp | Brightness control means |
| JPS5883882A (en) * | 1981-11-13 | 1983-05-19 | Ricoh Co Ltd | Device for recovering photoreceptor from fatigue |
-
1984
- 1984-12-10 JP JP59262175A patent/JPS61138267A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52113225A (en) * | 1976-03-19 | 1977-09-22 | Mitsubishi Electric Corp | Brightness control means |
| JPS5883882A (en) * | 1981-11-13 | 1983-05-19 | Ricoh Co Ltd | Device for recovering photoreceptor from fatigue |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61138267A (en) | 1986-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH06175452A (en) | Electrophotographing device | |
| JPH0436382B2 (en) | ||
| JPS59136728A (en) | Image forming device | |
| JPS61254961A (en) | Color image forming device | |
| JP4773707B2 (en) | Image forming apparatus | |
| JP3286899B2 (en) | Control method of image forming apparatus | |
| JP2004078088A (en) | Image forming apparatus | |
| JP3309306B2 (en) | Digital image forming equipment | |
| JPH06230642A (en) | Potential controller for photosensitive body | |
| JPH0792748A (en) | Method for adjusting density parameter | |
| JP3188228B2 (en) | Image density correction device | |
| JPH09284556A (en) | Image forming device | |
| JPH07104630B2 (en) | Electrostatic image forming device | |
| JPS63128371A (en) | Recorder | |
| JP2623599B2 (en) | Color electrophotographic equipment | |
| JPH0777853A (en) | Process controller | |
| JP3406754B2 (en) | Image forming device | |
| JPS6290671A (en) | Exposure level control for copying machine | |
| JPS62108269A (en) | Recorder | |
| JP4294443B2 (en) | Drive control apparatus, drive control method, image forming apparatus, image reading apparatus, and program | |
| JPH0746927Y2 (en) | Toner supply device | |
| JPH08679Y2 (en) | Toner image density detector for copier | |
| JPH06289716A (en) | Density adjusting method for image recorder | |
| JPH05122481A (en) | Image formation device | |
| JPH08106217A (en) | Image density control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |